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Bethany Ehlmann

Posted inEditors' Highlights

Extremeness of Seasons Determined by Planetary Motion Parameters

by Bethany Ehlmann 7 November 20227 November 2022

We’ve long known that a planet’s orbital period and tilt determine length and intensity of seasons. We now see rotation rate matters too: max temperature shifts poleward as rotation slows.

Posted inEditors' Highlights

Ceres: Missing Craters, Crust Thickness Variation by Interior Convection

by Bethany Ehlmann 18 July 202217 February 2023

Models show that several puzzling features about Ceres’ topography, gravity anomalies, and crater size distribution may be explained by asymmetric hemispherical convection due to radiogenic heating.

Chart plotting the evidence presented in the commentary by Weiss and Bottke.
Posted inEditors' Highlights

Fingerprints of Jupiter Formation

by Bethany Ehlmann 16 June 202127 January 2022

Meteorite isotopes, meteorite paleomagnetics, and planet formation models collectively show Jupiter formation via first slow then fast collection of material by core accretion in <5 million years.

Chart showing that results from a family of simulations that track changing pressures of three gases
Posted inEditors' Highlights

Is Atmospheric Oxygen a Planetary Signature for Life?

by Bethany Ehlmann 21 April 202115 March 2022

While some Earth-like worlds can generate significant O2 only by biology, “waterworlds” and “desert worlds” can build up O2 even without life because of chemical changes from atmosphere loss to space.

An aurora as seen from the International Space Station.
Posted inAGU News

AGU Advances Goes Online

Eric Davidson, president-elect of AGU by Susan Trumbore, A. Barros, Eric Davidson, Bethany Ehlmann, J. Famiglietti, N. Gruber, Mary Hudson, T. Illangasekare, Sarah Kang, T. Parsons, P. Rizzoli, V. Salters, B. Stevens, D. Wuebbles, Peter Zeitler and T. Zhu 7 August 20193 April 2023

Featuring high-impact papers and a streamlined process, AGU’s new journal is ready to launch.

Posted inEditors' Vox

A Rover’s Eye View of Moving Martian Dunes

by A. Deanne Rogers and Bethany Ehlmann 21 November 201724 April 2024

A new special issue of JGR: Planets presents findings on sand motion, morphology, and mineralogy from the Curiosity rover’s traverse of the active Bagnold dune field in Gale crater.

Posted inScience Updates

Developing an Updated, Integrated Understanding of Mars

by Bethany Ehlmann, D. Beaty and M. Meyer 30 September 201431 October 2022

The Eighth International Conference on Mars;
Pasadena, California, 14–18 July 2014

A view of a Washington, D.C., skyline from the Potomac River at night. The Lincoln Memorial (at left) and the Washington Monument (at right) are lit against a purple sky. Over the water of the Potomac appear the text “#AGU24 coverage from Eos.”

Features from AGU Publications

Research Spotlights

Deforestation Is Reducing Rainfall in the Amazon

19 May 202519 May 2025
Editors' Highlights

Bringing Storms into Focus

19 May 202515 May 2025
Editors' Vox

Decoding Crop Evapotranspiration

6 May 20256 May 2025
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